Synthesis of nano structural WC-Co powders from water soluble precursors: Effects of tungsten source and synthesis atmosphere on chemical and phase structure evolutions

Ulla Kanerva, Marjaana Karhu, Juha Lagerbom, Anna Kronlöf, Erja Turunen

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Thermal sprayed cemented carbides such as WC-Co(Cr) and Cr3C2-NiCr coatings are widely used in wear protection purposes. Submicron and multimodal carbides in cermets showed promising results in hardness and wear performance. Presented study is a part of the research aiming to create a new novel powder manufacturing route for homogenous nano WC + Co matrix powder for thermal spraying. Goal of this study was to compare the effects of raw materials (tungsten source) and synthesis atmospheres on synthesis steps and on chemical and phase structures of the final products. Powders were manufactured via spray drying method from water based solution with raw materials ammonium para tungstate (APT) or ammonium meta tungstate (AMT) as a tungsten source, glycine as a carbon source and cobalt acetate as a cobolt source. Dried products were heat treated in Ar and Ar-4H2 atmospheres at different temperatures. The thermal decomposition was studied by using Thermogravimetry (TGA) and evolved gas analysis with mass spectrometer. The morphology and particle size were analysed with scanning electron microscopy (SEM) and an X-ray diffractometer (XRD) was used for phase structure analysis. Results suggest that AMT is a better raw material as a tungsten source for this method. Heat treatment atmosphere have effects on the chemical and phase structure for raw materials but not for the final product.
Original languageEnglish
Title of host publicationAbstract Book of the 39th International Conference and Expo on Advanced Ceramics and Composites, ICACC’15
PublisherAmerican ceramic society
Pages58
Publication statusPublished - 2015
Event39th International Conference and Expo on Advanced Ceramics and Composites, ICACC’15: ICACC’15 - Daytona Beach, United States
Duration: 25 Jan 201530 Jan 2015
Conference number: 39

Conference

Conference39th International Conference and Expo on Advanced Ceramics and Composites, ICACC’15
CountryUnited States
CityDaytona Beach
Period25/01/1530/01/15

Fingerprint

Tungsten
Phase structure
Powders
Raw materials
Ammonium Compounds
Water
Carbides
Wear of materials
Thermal spraying
Spray drying
Gas fuel analysis
Cermets
Diffractometers
Mass spectrometers
Cobalt
Glycine
Thermogravimetric analysis
Acetates
Pyrolysis
Carbon

Keywords

  • nano-sized WC synthesis
  • water soluble precursors
  • spray drying
  • ProperPart

Cite this

Kanerva, U., Karhu, M., Lagerbom, J., Kronlöf, A., & Turunen, E. (2015). Synthesis of nano structural WC-Co powders from water soluble precursors: Effects of tungsten source and synthesis atmosphere on chemical and phase structure evolutions. In Abstract Book of the 39th International Conference and Expo on Advanced Ceramics and Composites, ICACC’15 (pp. 58). American ceramic society.
Kanerva, Ulla ; Karhu, Marjaana ; Lagerbom, Juha ; Kronlöf, Anna ; Turunen, Erja. / Synthesis of nano structural WC-Co powders from water soluble precursors : Effects of tungsten source and synthesis atmosphere on chemical and phase structure evolutions. Abstract Book of the 39th International Conference and Expo on Advanced Ceramics and Composites, ICACC’15. American ceramic society, 2015. pp. 58
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abstract = "Thermal sprayed cemented carbides such as WC-Co(Cr) and Cr3C2-NiCr coatings are widely used in wear protection purposes. Submicron and multimodal carbides in cermets showed promising results in hardness and wear performance. Presented study is a part of the research aiming to create a new novel powder manufacturing route for homogenous nano WC + Co matrix powder for thermal spraying. Goal of this study was to compare the effects of raw materials (tungsten source) and synthesis atmospheres on synthesis steps and on chemical and phase structures of the final products. Powders were manufactured via spray drying method from water based solution with raw materials ammonium para tungstate (APT) or ammonium meta tungstate (AMT) as a tungsten source, glycine as a carbon source and cobalt acetate as a cobolt source. Dried products were heat treated in Ar and Ar-4H2 atmospheres at different temperatures. The thermal decomposition was studied by using Thermogravimetry (TGA) and evolved gas analysis with mass spectrometer. The morphology and particle size were analysed with scanning electron microscopy (SEM) and an X-ray diffractometer (XRD) was used for phase structure analysis. Results suggest that AMT is a better raw material as a tungsten source for this method. Heat treatment atmosphere have effects on the chemical and phase structure for raw materials but not for the final product.",
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Kanerva, U, Karhu, M, Lagerbom, J, Kronlöf, A & Turunen, E 2015, Synthesis of nano structural WC-Co powders from water soluble precursors: Effects of tungsten source and synthesis atmosphere on chemical and phase structure evolutions. in Abstract Book of the 39th International Conference and Expo on Advanced Ceramics and Composites, ICACC’15. American ceramic society, pp. 58, 39th International Conference and Expo on Advanced Ceramics and Composites, ICACC’15, Daytona Beach, United States, 25/01/15.

Synthesis of nano structural WC-Co powders from water soluble precursors : Effects of tungsten source and synthesis atmosphere on chemical and phase structure evolutions. / Kanerva, Ulla; Karhu, Marjaana; Lagerbom, Juha; Kronlöf, Anna; Turunen, Erja.

Abstract Book of the 39th International Conference and Expo on Advanced Ceramics and Composites, ICACC’15. American ceramic society, 2015. p. 58.

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

TY - CHAP

T1 - Synthesis of nano structural WC-Co powders from water soluble precursors

T2 - Effects of tungsten source and synthesis atmosphere on chemical and phase structure evolutions

AU - Kanerva, Ulla

AU - Karhu, Marjaana

AU - Lagerbom, Juha

AU - Kronlöf, Anna

AU - Turunen, Erja

N1 - Project code: 10711

PY - 2015

Y1 - 2015

N2 - Thermal sprayed cemented carbides such as WC-Co(Cr) and Cr3C2-NiCr coatings are widely used in wear protection purposes. Submicron and multimodal carbides in cermets showed promising results in hardness and wear performance. Presented study is a part of the research aiming to create a new novel powder manufacturing route for homogenous nano WC + Co matrix powder for thermal spraying. Goal of this study was to compare the effects of raw materials (tungsten source) and synthesis atmospheres on synthesis steps and on chemical and phase structures of the final products. Powders were manufactured via spray drying method from water based solution with raw materials ammonium para tungstate (APT) or ammonium meta tungstate (AMT) as a tungsten source, glycine as a carbon source and cobalt acetate as a cobolt source. Dried products were heat treated in Ar and Ar-4H2 atmospheres at different temperatures. The thermal decomposition was studied by using Thermogravimetry (TGA) and evolved gas analysis with mass spectrometer. The morphology and particle size were analysed with scanning electron microscopy (SEM) and an X-ray diffractometer (XRD) was used for phase structure analysis. Results suggest that AMT is a better raw material as a tungsten source for this method. Heat treatment atmosphere have effects on the chemical and phase structure for raw materials but not for the final product.

AB - Thermal sprayed cemented carbides such as WC-Co(Cr) and Cr3C2-NiCr coatings are widely used in wear protection purposes. Submicron and multimodal carbides in cermets showed promising results in hardness and wear performance. Presented study is a part of the research aiming to create a new novel powder manufacturing route for homogenous nano WC + Co matrix powder for thermal spraying. Goal of this study was to compare the effects of raw materials (tungsten source) and synthesis atmospheres on synthesis steps and on chemical and phase structures of the final products. Powders were manufactured via spray drying method from water based solution with raw materials ammonium para tungstate (APT) or ammonium meta tungstate (AMT) as a tungsten source, glycine as a carbon source and cobalt acetate as a cobolt source. Dried products were heat treated in Ar and Ar-4H2 atmospheres at different temperatures. The thermal decomposition was studied by using Thermogravimetry (TGA) and evolved gas analysis with mass spectrometer. The morphology and particle size were analysed with scanning electron microscopy (SEM) and an X-ray diffractometer (XRD) was used for phase structure analysis. Results suggest that AMT is a better raw material as a tungsten source for this method. Heat treatment atmosphere have effects on the chemical and phase structure for raw materials but not for the final product.

KW - nano-sized WC synthesis

KW - water soluble precursors

KW - spray drying

KW - ProperPart

M3 - Conference abstract in proceedings

SP - 58

BT - Abstract Book of the 39th International Conference and Expo on Advanced Ceramics and Composites, ICACC’15

PB - American ceramic society

ER -

Kanerva U, Karhu M, Lagerbom J, Kronlöf A, Turunen E. Synthesis of nano structural WC-Co powders from water soluble precursors: Effects of tungsten source and synthesis atmosphere on chemical and phase structure evolutions. In Abstract Book of the 39th International Conference and Expo on Advanced Ceramics and Composites, ICACC’15. American ceramic society. 2015. p. 58